Corundum-mullite low-cement self-flowing castable and method for repairing hot air outlet of top-combustion hot blast stove by using corundum-mullite low-cement self-flowing castable

Abstract

The invention discloses a corundum-mullite low-cement self-flowing castable and a method for repairing a hot air outlet of a top combustion hot blast stove by using the same, and belongs to the technical field of amorphous refractory materials. The castable consists of the following components in parts by weight: 5-15 parts of tabular corundum 5-3mm particles, 51-5 parts of tabular corundum 3-1mmparticles, 5-15 parts of tabular corundum 1-3mm particles, 5-15 parts of andalusite 5-3mm particles, 5-15 parts of andalusite 3-1mm particles, 2-10 parts of andalusite 1-3mm particles, 10-20 parts ofbrown fused alumina 200-mesh powder, 1-10 parts of brown fused alumina 325-mesh powder, alumina micro-powder, kyanite, a binding agent, 96 silica powder, a water reducing agent, an explosion-proof agent and an additive. The excellent use performance of the material and a complete and rapid construction method matched with the material can be used for rapidly repairing the problem part, ensuring the subsequent service life of the part and assisting an iron-making system to rapidly reproduce.

Description

technical field [0001] The invention belongs to the technical field of unshaped refractory materials, and particularly relates to a preparation method and a construction method of a corundum mullite low-cement self-flowing castable for quickly repairing the hot air outlet of a top-fired hot blast stove. Background technique [0002] As we all know, the hot blast stove is an important place to provide continuous and controllable hot air to the ironmaking system. Due to the unique structure and production process of the top-fired hot blast stove, it is determined that the original refractory lining around the hot blast outlet of the combustion chamber is at In a more severe use environment, when the top-fired hot blast stove is in normal production, the temperature at the hot blast outlet of the hot blast stove is the highest, which is a thermal stress concentration area, and the rising height of the hot blast stove body and the position of the hot blast branch pipe are relativ...

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Problems solved by technology

[0003] In order to solve the above-mentioned problems, the existing methods for repairing the refractory lining of top-fired hot blast stoves mainly include the following two methods: 1. Partial repair, local replacement of damaged brick linings and checker bricks. After partial repair, the phenomenon of brick lining loosening, shifting, cracking and falling off still occurred within a short period of time

2. Overhaul, replace the damaged combustion chamber, regenerator and checker bricks, and replace the brick lining of the large wall and cone section at the same time. Although the effect is good, the repair cost is high and the construction period is long

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